Re: [PATCH 0/3] vmcoreinfo support for dump filtering

Ken'ichi Ohmichi
2007-09-03T08:17:55Z

Hi,

2007/08/22 21:08:38 +0900, Ken'ichi Ohmichi <oomichi@mxs.nes.nec.co.jp> wrote:
>
>Hi Andrew,
>
>This patch set frees the restriction that makedumpfile users should
>install a vmlinux file (including the debugging information) into
>each system.
>
>makedumpfile command is the dump filtering feature for kdump.
>It creates a small dumpfile by filtering unnecessary pages for the
>analysis. To distinguish unnecessary pages, it needs a vmlinux file
>including the debugging information. These days, the debugging package
>becomes a huge file, and it is hard to install it into each system.
>
>To solve the problem, kdump developers discussed it at lkml and kexec-ml.
>As the result, we reached the conclusion that necessary information
>for dump filtering (called "vmcoreinfo") should be embedded into the
>first kernel file and it should be accessed through /proc/vmcore
>during the second kernel.
>(http://www.uwsg.iu.edu/hypermail/linux/kernel/0707.0/1806.html)
>
>Dan Aloni created the patch set for the above implementation.
>(http://www.uwsg.iu.edu/hypermail/linux/kernel/0707.1/1053.html)
>
>And I updated it for multi architectures and memory models.
>(http://lists.infradead.org/pipermail/kexec/2007-August/000479.html)
>
>
>PATCH SET:
>[1/3] [linux] Add vmcoreinfo
> The patch is for linux-2.6.22.
> The patch adds the vmcoreinfo data. Its address and size are output
> to /sys/kernel/vmcoreinfo.

The patch for linux (add-vmcoreinfo.patch) is included in 2.6.23-rc4-mm1.
http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.23-rc4/2.6.23-rc4-mm1/announce.txt

Thank you for your cooperation.

>[2/3] [kexec-tools] Pass vmcoreinfo's address and size
> The patch is for kexec-tools-testing-20070330.
> (http://www.kernel.org/pub/linux/kernel/people/horms/kexec-tools/)
> kexec command gets the address and size of the vmcoreinfo data from
> /sys/kernel/vmcoreinfo, and passes them to the second kernel through
> ELF header of /proc/vmcore. When the second kernel is booting, the
> kernel gets them from the ELF header and creates vmcoreinfo's PT_NOTE
> segment into /proc/vmcore.

Horms, could you please merge the above patch ?

>[3/3] [makedumpfile] Extract vmcoreinfo from /proc/vmcore
> The patch is for makedumpfile v1.1.6.
> (https://sourceforge.net/projects/makedumpfile/)
> makedumpfile command extracts the vmcoreinfo data from /proc/vmcore
> and uses it for dump filtering.

I will release the next makedumpfile with the above patch.

Thanks
Ken'ichi Ohmichi